is necessary for the investigation is possessed by every one.
I have come to the law which I shall now formulate by a method the validity of which I shall now have to prove. The law runs as follows: "For true sexual union it is necessary that there come together a complete male (M) and a complete female (F), even although in different cases the M and F are distributed between the two individuals in different proportions."
The law may be expressed otherwise as follows:
If we take μ, any individual regarded in the ordinary way as a male, and denote his real sexual constitution as Mμ, so many parts really male, plus Wμ, so many parts really female; if we also take ω, any individual regarded in the ordinary way as a female, and denote her real sexual constitution as Wω, so many parts really female, plus Mω, so many parts really male; then, if there be complete sexual affinity, the greatest possible sexual attraction between the two individuals, μ and ω,
(1) Mμ (the truly male part in the "male") + Mω (the truly male part in the "female") will equal a constant quantity, M, the ideal male; and
(2) Wμ + Wω (the ideal female parts in respectively the "male" and the "female") will equal a second constant quantity, W, the ideal female.
This statement must not be misunderstood. Both formulas refer to one case, to a single sexual relation, the second following directly from the first and adding nothing to it, as I set out from the point of view of an individual possessing just as much femaleness as he lacks of maleness. Were he completely male, his requisite complement would be a complete female, and vice versa. If, however, he is composed of a definite inheritance of maleness, and also an inheritance of femaleness (which must not be neglected), then, to complete the individual, his maleness must be completed to make a unit; but so also must his femaleness be completed.
